The table presents the demand of a product. By simple three-months moving average method, the demand-forecast of the product for the month of September is

$$\begin{array}{|l|c|} \hline \\ \textbf{Month} & \textbf{Demand} \\ \hline \text{January} & 450 \\ \hline \text{February} & 440 \\ \hline \text{March} & 460 \\ \hline \text{April} & 510 \\ \hline \text{May} & 520 \\ \hline \text{June} & 495 \\ \hline \text{July} & 475 \\ \hline \text{August} & 560 \\ \hline \end{array}$$

1. $490$
2. $510$
3. $530$
4. $536.67$
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